Improvement in file-cutting machines



No. 141,300. r PmenmrM13/29,1373."A y

2 S'heets--Sheet A2.

A. WEED.

File-'Cutting Machines. No. 141,300. ParentedJuly 29,1873.-

Mn/asses,

www i AM. PHoro -L/rHuG/fAPHl c 00A A'. Y. (mia/m55 Penne-'mg UNITED STATES PATENT OFFICE.

ALFRED WEED, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN FILE-CUTTING MACHINES.

Specification forming part of Letters Patent No. 141,300, dated July 29, 1873 application filed March 8, 1873.

To all whom it may concern:

Be it known that I, ALFRED WEEE, of

Boston, in the county of Suffolk and State of the cutter in forming the tooth is made an element of the feeding operation, the cutter being raised after the tooth is formed and carried back over the spur, then down behind the spur, then forward against the spur,

meeting which it moves the n'le forward on its bed, the cutter being then in position, so far at least as its edge is concerned, for the blow of the hammer.

My present invention Vhas reference to a similar method of effecting the feeding and cutting, or to a method in which each raised tooth or spur is used as a gage to determine the position of the cutter in cutting the :nekt tooth, and as the point against which the feeding device acts to feed forwardthe tile, but, instead of making the cutter the feeder, l use a shoe, attached to the cutter-arm, for the feeding device, lifting the cutter after each blow, and then pushing forward the shoe against the spur, striking which it moves the tile-blank with it, the shoe resting upon the blank just back of the cutter at all times, and the cutter being raised by a suitable spring after each blow, or as soon as the hammer rises from the cutter-head. My invention consists, primarily, in combining with the cutter a feed foot or shoe that is moved forward against the spur formed by the cutter, to effect the feed, the cutter rising for such movement, and the feed-foot drawing back after feeding the blank for the blow of the cutter.

The drawing represents a machine embodying the invention. y

Figure 1 shows the machine in front elevation. Fig. 2 is a plan of it.

a denotes the frame of the machine, Vhav-v ing at its front end a bed, b, upon which is mounted a support, c, for the file-bed d, upon which latter bed the file-blank rests, the iile being confined to the bed as to end movement, and it and the bed being fed together. The support c is adjustable laterally upon the bed b, having guide-tenons entering mortises in the bed, and an adjusting-screw, e, entering the bed, rotation of this screw adjusting the position ofthe iile under the cutter. The file-bed is held by the frictional contact of a brake, f, forced against the tile-bed by the stress ot' a spring, g. Over the support c is the cutter-arm h, pivoted on a stud-pin, t', eX- tending from an arm, k,'whicl1 arm is pivoted to the frame a by a pin, l. The cutter-arm is forced down by the stress of a spring, m, acting against a tail-piece, n, extending back of the arm, said tail-piece and arm being a lever turning on the pivot t', and the downward pressure ofthe arm is adjustably regulated by varyin g the stress of the spring by a screw, o, or other suitable device. In the front end of the arm is pivoted the shank of the feedfoot p, which foot may be directly pivoted by a vertical pin, g, to a stock, r, fastened to the arm by a pin, s, and the forward edge of this foot rests directly upon the tile or file-blank. In the front of the arm is iitted a slide, t, having an arm, a, under which is a blockspring, c, and from the front of this slide projects a pin, w, to which is pivot-ed the cutter .tu The cutter is normally held above the file by the spring c, but compression of the spring permits the cutter to be driven down against the file to make'the cut. The blow upon the cutter is effected by a hammer, y, whose arm e is fixed upon the end of a shaft, a2, and carries an arm, b2, which is raised by a cam, c2, on the driving-shaft, the hammer being driven down by a suitable spring, d2, when the cam-shoulder e2 passes the arm b2. The force of the blow of the hammer may be adjustably regulated by a screw, wz, acting against the spring d2.

The feed movement of the feed-foot p is effected as follows: Upon a pin, f2, projecting from the arm lc, is hung a loose roll, g2, which, by the stress of the spring m, is held against a cam or eccentric, h2, on the end of the driving-shaft z2, except when otherwise held. As the hammer begins to rise after giving the blow the eccentric presses forward the foot which rests upon the file, said foot first slipping upon the file-surface until it reaches the spur thrown up by the cutter, and then moving forward the file by contact with the spur. Having thus fed forward the file the eccentric or cam lets back the arm k, and the feed-foot slips back, (as the cutterarm moves back,) such rear movement ceasing when the cutterarm reaches a position to bring the cuttingedge into position to be struck by the hammer to cut a tooth. The cutter being then driven down the tooth is cnt and the hammer drawn up after the cut Without movement of the file, the cutter being raised by the spring c when the hammer rises. The hammer having risen the feed-foot is moved forward, as before, to again feed the file, and having fed the le is again drawn back for the blow of the hammer upon the cutter.

To hold the ile firmly and in stationary position when the feed-foot moves back and until the blow is given, and permit perfect freedom of forward movement under the action of the feed-foot, a holding and releasing mechanism is used, as follows: Through the frame a extends a horizontal shaft, i2, at the front end of which is an arm, k2, having extending from its end a pin, l2, which projects over the iile. At the opposite end of the shaft is an arm, m2, upon which rests a spring, n2, (the spring being attached to an arm, o2, extending in thc opposite direction from the shaft-,) and the free end of this spring extends under the driving-shaft. When the feed-foot is moving the le the spring is loose and leaves the pin l2 free to rise and fall and the file to move freely beneath it; but as soon as the feed of the file is completed and before the cutter-arm and feed-foot are drawn back a pin, p2, extending from the driving-wheel q2 strikes the spring and bears it down, the stress of the spring then turning the shaft i2 sufficiently to cause the pin L2 to press hard upon the le, the pressure continuing until the feed-foot has moved back and the blow of the hammer has been effected, the pin p2 passing beyond the spring as Soon as the hammer has fallen.

The machine thus organized may be chan ged for a feed-motion effected by the cutter, as-

shown in my said patent, No. 123,849, by removing the feed-foot p and spring c, and substituting for the eccentric h2 a cam-sleeve having two peripheral cams, as shown in my said patent, one for pressing the arm k forward to effect the feed movement of the cutter, and the other for raising the cutter-arm to lift the cutter from the recess cut by it informing the tooth, so that it may be drawn back to descend again upon the file behind the spur for its next forward movement that feeds the file and positions the cutter preparatory to the next blow of the hammer.

The general organization of the machine (apart from the use of the spur as an element of the feeding) is well adapted for file-cuttin g machines using a feeding device that obtains its feeding-hold by pressure against the top and smooth surface of the blank, the blow of the hammer, the forward feed movement of the cutter-arm to which the feed-foot is attached, and the griping of the le being effected in the same manner as has been described,

and there being in addition simply a spring or other'device for pressing down the feedfoot 1J to enable it to effect the feed, with provision for releasing such pressure for the back movement of the said foot.

I claiml. In combination with thecutter having an upward movement after the blow and rise of the hammer, the feed-foot p, which moves forward against the spur raised by the cutter and feeds the file, substantially as described.

2. In combination with the file-feed and cutting mechanism, the griper-pin Z2 extending out from the arm k2 of the shaft i2, said shaft being turned by the action of the spring u2 produced by the pin p3 or its equivalent, substantially as described.

3. The improvement in le cutting machines, the same consisting of the shaft a?, hammer y, arm b2, spring d2, cam and driving shaft i2, cam e2, eccentric or cam h?, arm k, arm u, cutter-arm h, and spring m, combined and arranged 'to operate substantially as shown.

ALFRED WEED.

NVitnesses:

FRANCIS GoULD, M. W. FRofrHINc-HAM. 

